powerpc/ps3: Fix system hang with GCC 5 builds

GCC 5 generates different code for this bootwrapper null check that
causes the PS3 to hang very early in its bootup. This check is of
limited value, so just get rid of it.

Cc: stable@vger.kernel.org
Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/boot/ps3-head.S b/arch/powerpc/boot/ps3-head.S
index b6fcbaf..3dc44b0 100644 (file)
--- a/arch/powerpc/boot/ps3-head.S
+++ b/arch/powerpc/boot/ps3-head.S
@@ -57,11 +57,6 @@ __system_reset_overlay:
        bctr
 
 1:
-       /* Save the value at addr zero for a null pointer write check later. */
-
-       li      r4, 0
-       lwz     r3, 0(r4)
-
        /* Primary delays then goes to _zimage_start in wrapper. */
 
        or      31, 31, 31 /* db16cyc */

diff --git a/arch/powerpc/boot/ps3.c b/arch/powerpc/boot/ps3.c
index 4ec2d86..a05558a 100644 (file)
--- a/arch/powerpc/boot/ps3.c
+++ b/arch/powerpc/boot/ps3.c
@@ -119,13 +119,12 @@ void ps3_copy_vectors(void)
        flush_cache((void *)0x100, 512);
 }
 
-void platform_init(unsigned long null_check)
+void platform_init(void)
 {
        const u32 heapsize = 0x1000000 - (u32)_end; /* 16MiB */
        void *chosen;
        unsigned long ft_addr;
        u64 rm_size;
-       unsigned long val;
 
        console_ops.write = ps3_console_write;
        platform_ops.exit = ps3_exit;
@@ -153,11 +152,6 @@ void platform_init(unsigned long null_check)
 
        printf(" flat tree at 0x%lx\n\r", ft_addr);
 
-       val = *(unsigned long *)0;
-
-       if (val != null_check)
-               printf("null check failed: %lx != %lx\n\r", val, null_check);
-
        ((kernel_entry_t)0)(ft_addr, 0, NULL);
 
        ps3_exit();